Many alternative approaches to the question can produce many dark scenarios, not all of which need be vast conspiracies. It might be just a couple of guys hatching a plot while killing off a few gallons of wine.
So a couple of amateurs, and drunk ones at that, know exactly how to fool the intelligence experts and pull it off AND know how to fool AQ and pull it off, even though AQ knows that OBL is dead. And you see this as a plausible theory? LOL A vast conspiracy is more likely than that.